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Mirrors > Home > NFE Home > Th. List > 19.23tOLD | Unicode version |
Description: Obsolete proof of 19.23t 1800 as of 1-Jan-2018. (Contributed by NM, 7-Nov-2005.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
19.23tOLD |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | exim 1575 |
. . 3
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2 | 19.9t 1779 |
. . . 4
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3 | 2 | imbi2d 307 |
. . 3
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4 | 1, 3 | syl5ib 210 |
. 2
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5 | nfnf1 1790 |
. . 3
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6 | nfe1 1732 |
. . . . 5
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7 | 6 | a1i 10 |
. . . 4
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8 | id 19 |
. . . 4
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9 | 7, 8 | nfimd 1808 |
. . 3
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10 | 19.8a 1756 |
. . . . 5
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11 | 10 | a1i 10 |
. . . 4
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12 | 11 | imim1d 69 |
. . 3
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13 | 5, 9, 12 | alrimdd 1768 |
. 2
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14 | 4, 13 | impbid 183 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-6 1729 ax-11 1746 |
This theorem depends on definitions: df-bi 177 df-ex 1542 df-nf 1545 |
This theorem is referenced by: (None) |
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